Processes Involving Acid Gas Solubility In Room Temperature Ionic Liquids (RTILs)
The literature contains a number of thermodynamic studies involving the solubility of acid gases in RTILs. This thesis looks at using these studies in the context of two processes: membrane separation and absorption refrigeration cycles. The first part of this study investigated the separation of a mixed dry gas feed of CO2/CH4 by four Stabilized Ionic Liquid Membranes (SILMs); 1-Ethyl-3-methlyimidazolium dicyanamide, [emim][DCA], 1-ethyl-3-methylimidazolium thiocyanate, [emim][SCN], 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [emim][Tf2N] and 1-Butyl-3-methylimidazolium nitrate, [bmim][NO 3]. The selectivities and permeances for the CO2/CH 4 feed were measured in all four SILMs at various partial pressures of CO2 in the feed and at two total feed pressures. This project part continued works that investigated the feasibility of using Room Temperature Ionic Liquid, RTIL, membranes in CO2/CH4 separation applications. In the second part of this report, we investigated the performance of a sulfur dioxide-RTIL (SO2/RTIL) absorption refrigeration cycle and compared the coefficient of performance, COP, to the standard ammonia-water absorption refrigeration cycle. This was achieved by simulating the absorption refrigeration cycle using SO2/RTIL pairs.
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